They're quite rare, and ignoring them simplifies things quite a bit, and further reduces the number of calls to `MonoItem::size_estimate` to the number of placed items (one per root item, and one or more per reachable inlined item).
They're quite rare, and ignoring them simplifies things quite a bit, and further reduces the number of calls to `MonoItem::size_estimate` to the number of placed items (one per root item, and one or more per reachable inlined item).